how to add up some numbers?

[Nebur]

Is it possible to add up an uknown amount of double numbers from a string in a single value?

Ex: I: 1,2 3,5 7 8
O: 19,7

Thanks everyone!

[MiiNiPaa]

Yes.

for example using stringstreams:

std::string str("1,2 3,5 7 8 ");
std::istringstream x(str);
double temp;
double accumulator(0);
while(x >> temp)
    accumulator += temp;

EDIT: Thanks Chervil. I have fixed my code. Guess I should sleep now.

[Chervil]

The example is correct, but there's a minor typo, the last line should read:

    accumulator += temp;

and line 2 should read:

std::istringstream x(str);

[Nebur]

Thanks for the code!

Can you explain a bit please?

[Chervil]

A istringstream allows input to be read in from a string, in the same way as from cin or from a file.

These two lines do most of the work (though the preceding lines set everything up)

while(x >> temp)
    accumulator += temp;

Here it is reading a number from the stringstream x into the variable temp
then temp is added to the accumulator. The while loop ends when there are no more numbers in the stringstream.